Hot-air furnace.



No. 683,355. Patented Sept. 24, [90L J. Tmms.

HOT AIR FURNACE.

(Application filed H. 2B. 1901.)

(110 Model.) 2 Sheets-Sheet I.

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-No. 683,355. 1 Patented Sept. 24, I90!.

' J. TIMMS.

HOT AIR FUBNAGE.

(Application filed Mar. 28. 1901,)

(No Model.) 2 Shuts-Sheet 2.

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UNITED STATES PATENT OFFICE.

JAMES TIMMS, OF COLUMBUS, OHIO.

HOT-AIR FURNACE.

SPEGIFIGATION forming part of Letters Patent N 0. 683,355, dated September 24, 1901..

Application filed March 28, 1901. Serial No. 53,210. (No model.)

To all whom it may concern.-

Be it known that I, JAMES TIMMS, of Columbus, in the county of Franklin and Stateof Ohio, have invented certain new and useful Improvements in Hot-Air Furnaces; and I do hereby declare the following to be a full,olear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in hot-air furnaces, the object of the invention being to so construct a furnace as to utilize the heat of the products of combustion to the fullest extent for heating air and to provide simple and efficient means for controlling the exit of heated air from the furnace.

With these objects in View the. invention consists in certain novel features of construction and combinations and arrangements of parts, as hereinafter set forth, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a'longitudinal sectional view of the furnace. Fig. 2 is a plan view. Fig. 3 is a transverse sectional view of the furnace.

In constructing my improved furnace I employ two sheet-metal boxes 12 to form airflues, and these boxes are spaced apart to form a furnacechamber 3 and a flue 4 for products of combustion. The box or flue 1 is made with a vertical portion 5 and an outwardlyinclined portion 6, and the box or flue 2 is constructed with a vertical portion 7, parallel with the part 5 of box 1,and with an outwardlyinclined portion 8, approximately parallel with the part 6 of the box 1. Between the inner walls of the vertical portions 5 7 of the respective boxes or flues the brick furnacechamber is built, and the smoke-outlet of the furnace communicates with the intermediate flue 4. The boxes 1 2 are inclosed by a wall 9, of brickwork, through the inner end of which an air-inlet flue 10 passes and communicates with the vertical portion 5 of the box or flue 1. An air-inlet pipe 1O communicates with the vertical portion of the box or flue 2. The wall 9, of brickwork or masonry, is made to overlap the top of the box 1, as shown at 11, Fig. 2, and the top of said box or flue 1 within the border 11, of brick, is covered with sand 12. I prefer, however, to place between the sand and the box or flue a layer 13 of asbestos.

The forward or upper end of the box or flue 1 is provided with any desired number of out lets 14, with which suitable pipes or flues may be connected for conveying hot air to difierent parts of a building. Heated air will be conveyed from the lower flue 2 to the upper flue 1 through U-shaped pipes 15 15, each of which is disposed outside the furnace structure and communicates at its respective ends with said flues. Each U-shaped pipe 15 is provided with a valve or damper 16, by means of which the passage of heated air from the flue 2 to the flue 1 can be controlled. In this way the amountand temperature of the heated air flowing through the pipes communicating with the flue and leading to various parts of abuilding can be easily regulated. If desired, hot-air flues may be connected with thimbles 17 on the U-shaped pipes 15, and in each of these thimbles a valve 18 is located.

The forward end of the smoke-flue 4 communicates, by means of a short pipe 19, having a valve 20, with the stack 21, and the lower end of the latter communicates with the space or chamber 22 under the box or flue 2. A valve or damper 23 is located in the stack for controlling the draft. The forward end of the smoke-flue 4 also communicates, by means of two externally-located pipes 24, with the space or chamber 22 at or near the inner end of the latter for the purpose of conveying products of combustion from the flue 4 to the space under the flue 2 to heat the lower Wall of said flue 2, and from said space or chamber 22 the products of combustion will enter thestack.

By means of the construction and arrangement of parts hereinbefore described the products of combustion passing through the intermediate flue 4 will heat the air in both flues 1 and 2 and the furnace per se will heat the air in the vertical portions of said flues. The hot products of combustion after having heated the air in both flues 1 2 will enter the space 22 through the pipes 24 and move along the bottom of the flue 2, thus further heating the air therein, and will escape from the space 22 to the stack, as before explained.

When the furnace is first started and a direct draft is desired, the valve or damper 20 will be opened and the valve or damper 23 closed, so as to causethe products of combustion to pass directly to the stack from the intermediate flue 4.

It is evident that with the structure herein described the products of combustion are very fully utilized to heat the air leaving the furnace with a minimum consumption of fuel. The heat of the products of combus tion is absorbed by the air in the two fines 1 2 while'said products are passing through the intermediate flue 4, and the air in the lower fine 2 absorbs heat remaining in the products of combustion when the latter'pass through the space under said lower flue, so that when the products of combustion reach the stack they will be comparatively cool. As the heated air from the lower flue 2 flows into the upper flue the air leaving the latter, having 2 can be closed and the heated air from the V flue 2 can, if desired, be conveyed directly to parts of the building. The temperatureof the air leaving the furnace might also be reduced, causing the products of combustion to enter the stack without passing through.

the space under the fine 2.

, Slight changes might be made in the details of construction of my invention without departing from the spiritthereof or limitingits scope, and hence I do not wish to limit myself to the precise details herein set forth.

Having fully described my invention, what Iclaim as new, and desire to secure by Letters Patent, is

, 1. In a hot-air furnace, the combination with a fire-chamber and two air-fines having inlets at one end and outlets at the other end,

, of means for passing products of combustion successively between said air-lines and under the bottom air-flue.

2. In a-hot-air furnace, the combination of afire-chamber two air-flues, asmoke-fiue communicating with the furnace-chamber and passing between the air-dues, pipes for conveying products of combustion from said smoke-flue into a space under the lower airfiue and a stack communicating with said space.

' 3. Ina hot-air furnace, the combination-of *a-fire chamber approximately parallel air- 4. In a hot-air furnace, the combination of a fire-chamber approximately parallel airfi'ues spaced apart and forming a smoke-flue between them, the upper air-flue having ontlets for hot air, external pipes connected at their respective ends with the respective airchambers, means for controlling thepassage of air through said pipes, and means for con- If a less.

trollingthe passage of air from intermediate portions of said pipes.

5. In a hot-air furnace, the combination of two boxes or air-fines spaced apart and having a fire-chamber and a smoke-flue between them, said air-fines extending laterally from the fire-chamber and disposed so as to leave a space below the lower flue, pipes connecting the outer end of said smoke-fine with the inner end of the space under the lower airflue, and a stack communicating with said space.

6. In ahot-air furnace, the combination of afire-chamber, two air-fines spaced apart and having a fire-chamber and a smoke-flue between them, the lower air-flue disposed so as to have a space below it, a stack communieating with the space under the lower air-flue andhaving a valved connection with the outer end of said smoke-flue, andpipes connecting the outer end of said smoke-flue with the in- .ner end of the space under the lower air-flue. 7. In a hotair furnace, the combinationwith' a structure comprising an upright portion having a fire-chamber therein,and a holllow elongated extension projecting upwardly and outwardly from said upright portion, of a fsmoke-fi ue communicating with the fire-chamjber and extending through the hollow exten jsion of the casing, said smoke-flue made elongated in cross-section and extending from one side wall to the other of said hollow extension so as to divide the same into two chambers one above and the'other below the smoke-flue, .means for supplying said chambers with cold air, and means for conveying the heated air from the lower to the upper air-chamberand means for conducting heated air from the latter.

8. In a hot-air furnace, the combination with a structure comprising an upright portion having a fire-chamber therein and a hollow elongated extension projecting upwardly and outwardly from said upright portion, of a smoke-flue communicating with the fire-chamber and projecting longitudinally through the center of the same and extending from side to side thereof forming air-chambers above and below the sm oke-fiue, an inlet at the base of the upright structure in front of the firebox to supply cold air to the chamber-above the smoke-flue, a cold-air inlet-pipe communicating with the upright structure in rearof the fire-box for supplying cold air to the hotair chamber below smoke-flue, hot-air outletpipes communicating with the upper end of the upper air-chambers in the elongated extension of the casing, and pipes connecting the lower with the upper air-chamber.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

JAMES TIMMS.

Witnesses:

F. C. EATON, W. A. MARSH. 

